refactor(config): deprecate packageJson option (#2034)

The option `packageJson` is not used in internal `ts-jest` so it makes sense to remove it.

src/__helpers__/fakers.ts

@@ -19,7 +19,6 @@ export function tsJestConfig(options?: Partial<TsJestConfig>): TsJestConfig {
     transformers: options?.transformers ?? Object.create(null),
     babelConfig: undefined,
     tsConfig: undefined,
-    packageJson: undefined,
     stringifyContentPathRegex: undefined,
     diagnostics: { ignoreCodes: [], pretty: false, throws: true },
     ...options,

src/config/__snapshots__/config-set.spec.ts.snap

@@ -214,10 +214,6 @@ Object {
     "throws": true,
   },
   "isolatedModules": false,
-  "packageJson": Object {
-    "kind": "file",
-    "value": undefined,
-  },
   "stringifyContentPathRegex": undefined,
   "transformers": Object {},
   "tsConfig": Object {
@@ -241,10 +237,6 @@ Object {
     "throws": true,
   },
   "isolatedModules": false,
-  "packageJson": Object {
-    "kind": "file",
-    "value": undefined,
-  },
   "stringifyContentPathRegex": undefined,
   "transformers": Object {},
   "tsConfig": Object {
@@ -268,10 +260,6 @@ Object {
     "throws": true,
   },
   "isolatedModules": false,
-  "packageJson": Object {
-    "kind": "file",
-    "value": undefined,
-  },
   "stringifyContentPathRegex": undefined,
   "transformers": Object {},
   "tsConfig": Object {

src/config/config-set.spec.ts

@@ -1,12 +1,12 @@
 /* eslint-disable jest/no-mocks-import */
 import type { Transformer } from '@jest/transform'
-import { testing } from 'bs-logger'
+import { LogLevels, testing } from 'bs-logger'
 import { join, resolve } from 'path'
 import ts from 'typescript'
 
 import { logTargetMock } from '../__helpers__/mocks'
-import { createConfigSet, defaultResolve } from '../__helpers__/fakers'
-import type { TsJestGlobalOptions } from '../types'
+import { createConfigSet } from '../__helpers__/fakers'
+import type { TsJestGlobalOptions, TsJestConfig } from '../types'
 import * as _backports from '../utils/backports'
 import { getPackageVersion } from '../utils/get-package-version'
 import { normalizeSlashes } from '../utils/normalize-slashes'
@@ -151,40 +151,33 @@ describe('tsJest', () => {
   })
 
   describe('packageJson', () => {
-    it('should be correct when packageJson is true', () => {
-      const EXPECTED = {
-        kind: 'file',
-        value: undefined,
-      }
-      expect(getTsJest().packageJson).toEqual(EXPECTED)
-      expect(getTsJest({ packageJson: true }).packageJson).toEqual(EXPECTED)
-    })
+    const logger = testing.createLoggerMock()
+    let tsJestCfg: TsJestConfig
 
-    it('should be correct for given file as string', () => {
-      const FILE = 'bar/tsconfig.foo.json'
-      const EXPECTED = {
-        kind: 'file',
-        value: defaultResolve(FILE),
-      }
-      expect(getTsJest({ packageJson: FILE }).packageJson).toEqual(EXPECTED)
+    beforeEach(() => {
+      logger.target.clear()
+      tsJestCfg = createConfigSet({
+        jestConfig: {
+          globals: {
+            'ts-jest': {
+              packageJson: true,
+            },
+          },
+        } as any,
+        logger,
+        resolve: null,
+      }).tsJest
     })
 
-    it('should be correct for given file as an object', () => {
-      const packageJsonStub = require('../__mocks__/package-foo.json')
-      const EXPECTED = {
-        kind: 'inline',
-        value: packageJsonStub,
-      }
-      expect(getTsJest({ packageJson: packageJsonStub }).packageJson).toEqual(EXPECTED)
+    it('should not contain packageJson in final tsJest config', () => {
+      expect(Object.keys(tsJestCfg)).not.toContain('packageJson')
     })
 
-    it('should be correct for inline config', () => {
-      const CONFIG = { foo: 'bar' }
-      const EXPECTED = {
-        kind: 'inline',
-        value: CONFIG,
-      }
-      expect(getTsJest({ packageJson: CONFIG as any }).packageJson).toEqual(EXPECTED)
+    it('should show warning message when packageJson is provided', () => {
+      expect(logger.target.filteredLines(LogLevels.warn)[0]).toMatchInlineSnapshot(`
+        "[level:40] The option \`packageJson\` is deprecated and will be removed in ts-jest 27. This option is not used by internal \`ts-jest\`
+        "
+      `)
     })
   })
 

src/config/config-set.ts

@@ -197,9 +197,6 @@ export class ConfigSet {
       options.tsConfig ?? options.tsconfig ?? true,
     )
 
-    // packageJson
-    const packageJson: TsJestConfig['packageJson'] = this.getInlineOrFileConfigOpt(options.packageJson ?? true)
-
     // transformers
     let transformers: ConfigCustomTransformer = Object.create(null)
     const { astTransformers } = options
@@ -260,6 +257,10 @@ export class ConfigSet {
       }
     }
 
+    if (options.packageJson) {
+      this.logger.warn(Deprecations.PackageJson)
+    }
+
     // babel config (for babel-jest) default is undefined so we don't need to have fallback like tsConfig or packageJson
     const babelConfig: TsJestConfig['babelConfig'] = this.getInlineOrFileConfigOpt(options.babelConfig)
 
@@ -290,7 +291,6 @@ export class ConfigSet {
     // parsed options
     const res: TsJestConfig = {
       tsConfig,
-      packageJson,
       babelConfig,
       diagnostics,
       isolatedModules: !!options.isolatedModules,

src/types.ts

@@ -172,22 +172,12 @@ interface TsJestConfig$babelConfig$inline {
   value: BabelConfig
 }
 type TsJestConfig$babelConfig = TsJestConfig$babelConfig$file | TsJestConfig$babelConfig$inline | undefined
-interface TsJestConfig$packageJson$file {
-  kind: 'file'
-  value: string | undefined
-}
-interface TsJestConfig$packageJson$inline {
-  kind: 'inline'
-  value: any
-}
-type TsJestConfig$packageJson = TsJestConfig$packageJson$file | TsJestConfig$packageJson$inline | undefined
 type TsJestConfig$stringifyContentPathRegex = string | undefined
 /**
  * @internal
  */
 export interface TsJestConfig {
   tsConfig: TsJestConfig$tsConfig
-  packageJson: TsJestConfig$packageJson
   isolatedModules: boolean
   compiler: string
   diagnostics: TsJestConfig$diagnostics

src/utils/messages.ts

@@ -39,6 +39,7 @@ export const enum Deprecations {
   HelperMovedToUtils = "The `{{helper}}` helper has been moved to `ts-jest/utils`. Use `import { {{helper}} } from 'ts-jest/utils'` instead.",
   AstTransformerArrayConfig = 'The configuration for astTransformers as string[] is deprecated and will be removed in ts-jest 27. Please define your custom AST transformers in a form of an object. More information you can check online documentation https://kulshekhar.github.io/ts-jest/user/config/astTransformers',
   TsConfig = 'The option `tsConfig` is deprecated and will be removed in ts-jest 27, use `tsconfig` instead',
+  PackageJson = 'The option `packageJson` is deprecated and will be removed in ts-jest 27. This option is not used by internal `ts-jest`',
 }
 
 /**